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Sat, 16 Jul 2016 09:35:48 +0000 To: From: Kevin Darbyshire-Bryant Message-ID: <5789FFEF.9010408@darbyshire-bryant.me.uk> Date: Sat, 16 Jul 2016 10:35:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [2a02:c7f:1216:da2b::4007:25d] X-ClientProxiedBy: HE1PR02CA0017.eurprd02.prod.outlook.com (10.162.33.27) To VI1PR0701MB2381.eurprd07.prod.outlook.com (10.168.138.135) X-MS-Office365-Filtering-Correlation-Id: 192bbec2-0ce5-425b-72bf-08d3ad5c9237 X-Microsoft-Exchange-Diagnostics: 1; VI1PR0701MB2381; 2:csHpG6Pm0zVKP4BcDynM0WzweHLfQGHik+5seXjfOWjf2ZDwHK3iOnbE/0oQ0QcG0F7aLcz6XmBB/x9CQdmPgohttl6zRIY65nD2BaxrDTml4J+rJsMYJrMthYgKZ7m9JpxqvUAMNYl005dVk0kS+pTqdnUpDOBUSPbf+5WYolH/mXRCNHiLIwMD+oSaalNG; 3:KP3hVsPyWumYBxlMlh5cMlJy6SVtbLKotyIOCjROtPFCGtPZ8sOdHXk1Yl6+hOnJLU1GX1FOq/0HjcJVF6AaJkrjdaGiCCdT1BIJBGfGMwYwdxVprAkc8s25fa4cFOzs; 25:nmZZzJOiZrRD3Im3dmcIrGO9ceX+SGWPautYjMMUVO5+Xx7j2wjVrJLK8AcyIuEFHRf8I11xN2a0dvsat3RVCWnZEKxECsBkp3HMTJjxnJ/FI0m9/4pveRikqzAsbVamJOvaKUpK9g/WY+n+LnkWkgW5bbSoFNTJ7PGUlF7dmwMWEjXIrAbvSnsTWTZ3TkKv6ihRRCIvdGMKNcFjtiEV08EhGC1AN3ckKr2FopRdxej5v77wo5TOl/2/6obOwZfpZI97Ez7H3ixUApIa9X+z+eWNIq+niRV92/L1rr3XZbS4NZgc4RzMYFQPh+rN/aFtxMlEy7dT3GtHCJrcBM0Zyu7OWd424KJEISrxr8dj9KdamebAakejTptGnXXDIQQIm4jCAYtJy3FS5Iuoweq+Qjv2VlW/0/pn50cBZmf38lE= X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:VI1PR0701MB2381; 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VI1PR0701MB2381; 6:qXq7O17tM5JKtMWdH9zP1sVB9jfCrICN6F5K8hnbMqYyTNuSeAraAUUGknWel3udeJe30stdm/Q1xWEUrCVo8NGPv2FJLmuTWzwbe+QIfQhSEx2oW9/hJrct/i8Fad+/V+uXSeERKdd9QlNYKAGLJPE7Egr8x9AESs7HiHpoWstYKSy66tlavNVkPNh9u9z8wcecZhHaIgzCQqWaiViicxN0Y9WWj9avH3B2zSKVx2Gq6R2W8gdV8eQfVyu7iUvzQqVqwaKxlAVql+eR1xgmnAIkID7BTbmHUkhx8VR6YK33yJHP+eZCeuKSDWTI1n7h; 5:3Y9CYEXGtMALPrtvYcwngyboqXYd2uopW7eycFrSW1D3WfSG8QNQjRD3k/Kue5Xvd9DUf6eQxEnyc+A15ZDNkob8bp8tkdKSUMAcLTx3KVnxFnX7TGUxyg1jFuOb4XdYI1XZh3Syfz7jG6V1v4E9yw==; 24:CKhQZyssfXl4P3RjVIOSKXws3sCYxeIUuF2/9S8I15Q0Ba3TY6lv5Lbi9rkM9JjBKWl7vnuM/fm01gl/0gelN2FYvqcg+5dkhG80kByvDI4=; 7:AQJdL+aKWOWjqc0WxW3PNesKtd0B5VrDfzEE3wCTC1BSCkTAPQl88/3/UAOHldX/xY9AmgyR/s7HzYtJYw8hD/2jQWrCxyOD/v6xvGBJZk/hgqYKyzdLDKvUTFM9O6FSJ7pcWTJHbEm256u0jrMMZiz9cWglVmVV4gFR903L8HxtKI2Zs1HCssw/bUdiDqv6ZCyYnIXi3JDdE4AEv4qvwEy8mRiPGkRLuSd/4WpI138uIA4/31WPkGwkgRpMWVM9 SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: darbyshire-bryant.me.uk X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jul 2016 09:35:48.8473 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0701MB2381 Subject: [Cake] Cake strange behaviour X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Jul 2016 09:35:52 -0000 Hi guys, Encountering some behaviour that I don't understand. Line is a 40/10 cake limited to 39000/9840. Overheads 12, 'dual-dsthosts' in ingress, 'dual-srcshosts' on engress - limiting the on the WAN line. Take a look at my ping response graph http://www.thinkbroadband.com/ping/share/9822cb5160582fa6abee29b60d807766-16-07-2016.html Around 20:30 I fired up a windows machine that was behind on its updates so it generated a bit of ingress traffic. Note the comparatively high latency (40ms) and stupidly high ping packet loss (50%) The 3-5ms steady (blue) latency you can see is a system backup (so egress traffic) running till around 23:00. The really strange bit is that cake stats show it has only dropped 10 (yes 10!) packets. I'm not the only person encountering 'interesting' behaviour with regard to windows updates inducing high latency and high packet loss. It's as if cake weren't there managing flows and this is the ISP's rate limiter in action. Kevin